A method for stability and performance analysis of low oversampling ratio higher order sigma delta noise shaper architectures

This paper demonstrates a method for determining the stability and sensitivity of feedback coefficient variations of sigma delta noise shapers using a model based on parameterized quantization gain which varies from sample to sample. The method is demonstrated for two types of sigma delta converter structures, the 4th order multibit cascaded structure and the 5th order single stage 1-bit structure.